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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dcde3bee006117eb117f99c557ae0d9ef6ac0a880ee4941a39eaa6c6474c555' 
  AND token = 'L2ZVF5YA1HUAUbVZDciSfmQ0EzrP5B4vtect46kWhZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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