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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4767ffdc5ab9870ac396b79d211c625c70a130bbd07262aa6a3730d56bc613' 
  AND token = 'YJm+TdaZVUc7WA1dMLuKwfuyL3at+5N8QXDlV6Y35gk=' 
  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"
    }
  }
}