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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d9e1ad5597670c670e717d37b03f59d76302d193cb4ac02ff9db6f0a3c264c' 
  AND token = 'Y38b6fB6zCpYfj81Tihjnh16NYv1BRH3gq8TnRsrRaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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