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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bc720d16d1b2d43b5b1ad7faac0385a56d761460fcc0d4540c9ee595e911cc' 
  AND token = 'EcC2JQDBfLkftaglk9rWwlWbXaf9/VKEdcgClZmuKJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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