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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdb556b9ac6756859b48c4f454763b6d718904f579f9a7dc0019beb69db7612' 
  AND token = 'RwBhc6rasjsOKe24pMWIpzK5QglkagwW7CePdBFCoSs=' 
  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"
    }
  }
}