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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653a9d0ca6bffa91f651cf798ae5415e82de3fd084f2eedf2f18bc06bf19ae42' 
  AND token = 'j45dhwarq7cWH/+UrE+F1SYXwNsHclcnn3riICO7fkY=' 
  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"
    }
  }
}