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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742734f34964d6447f9ebe9b94bf78509508c3085a5f135ea49b47d624c82131' 
  AND token = 'xXaaiCLm6GqVDQJ3KScb9KWMN9z314QaObUvkbXbpls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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