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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be4295730ece7620fa55558e5fc5bb3904f76abd35edb4e3d740a39d65fc0fa' 
  AND token = 'BJ2biCVpYZ0JZqiOUUGdQlElgx7NzJ2vJZcs3UPFVHI=' 
  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"
    }
  }
}