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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164afe8012f1aad84b3d9505e8f383fae239c9e83add304af53375a39cb97554' 
  AND token = '53u3lB8t9V3SqKjEM5YRt9ZwsP6kb1Mu14fmxMIu040=' 
  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"
    }
  }
}