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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecfb4f4c7ec985bab1a678b439bbd25a7e9cf19ba66fa1b9aacaeb11e24a6b82' 
  AND token = '/RORzTizTNArjsBwarJY+T7s3gMWV7IXqbetRzc6oKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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