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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225bcc909a4d9720c17c84bc05dba5e593cc7680efa1c6730d96c4d9b678cbdd' 
  AND token = 'Ck2PLz2EBcTGetiiyQBtXou5kSJdzHUQJB0sURvDvJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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