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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1e2ae1072d9ee7b70633562346b218efd3c6599e3a3dcc6a22e299d15d6cb3' 
  AND token = 'sW9KuQNsh9DObZ/Jala2XsbTfbNuZcmgiN4XucoDQ6s=' 
  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"
    }
  }
}