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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ab36510a69554b15056354ab562a434ed6f764a9e42be9be0c4004119a6f19' 
  AND token = 'zbUmD9xXpQM0iIn0SS6T3Ea03kUl/BxZ2cUpwg8CcGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}