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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c267e6fd9d9179257f945cf64b90770597b8b5b84aa9ada8e5ac389056b3db33' 
  AND token = 'lBnK+pxCYvDh95uu5CPrcrKkpCea9+V9Us40Za7Om7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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