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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44384d88cadc1f0ad05a920e5b6a0494c81249cfcdbf8006c20efaad7f3238aa' 
  AND token = '5QI3vnvIZY9AMll9xvM2MTkZLXAekGTvrd/Gx8oQT+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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