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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85aaa9245c95d8d99f5f90a2bb39271b5c5d7fc60e867fdfc5c3a73c0688340' 
  AND token = 'l3e044y3IdFszOnT9ul9VKmIbthgrpMEcKVWtaydX6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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