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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb3e80b490bd988171cc4e68443dc81b89edcf7a6b9aa62c59e83c08a8d4811' 
  AND token = 'LC4gBQjqk2cAaCs7wtjT0WMpYJQ7BjrQn6QI5wAdrXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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