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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec6229f73d729b4ff10654d27cda3cf6957f050fb3d84cc1081506678be2814' 
  AND token = 'wkvYsDJ/o1Bag5WZKDe1c38e1lHoQhGWHe6gRR9cExw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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