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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41f4212d97529b812f124e19de9f8618beee3a5dcfe67724ff138c56a4d9446' 
  AND token = 'YW8hmJ5WJdNt6CS3PwNb4sc0c9jh/Sh2wv72e4RwQrs=' 
  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"
    }
  }
}