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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ff9db5969cba99a9321cc74be5da8b14025981f23f3a06707ec2ff21b3452b' 
  AND token = 'cqlQE0popO9qaYi6GcVCm3mkAW2rvKy1s4j3Dw4BdL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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