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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed5db87033d4fc4fa1b299f5eb0fa35ab906ee79a698d017fecb83b5eca6ba8' 
  AND token = 'x5WhX3xlCuG7wfv6DYPHGvXvju5ZrnXtjZxm2aYa1YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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