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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1d23728ae723d859b6f8d6215e750f42878515a4a3c6464d6e7201ee24886d' 
  AND token = 'yrr9yc5SOuM6qvDJFA6r4U3yrnhBnRG7DeuOjFNt7nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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