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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60c29213227cc0f4f7082f6b796fde11be357230491f3f6da9f089380bc6b26' 
  AND token = '8xcjsqAYYaUbCyj4RokBofWyqzvB8+z7Sbyf4J+mlSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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