Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7ecaaa97034f8228e83722c66e336922b8d7d39fb7a52d0ad446d2467c1f45' 
  AND token = 'MLWfNDmOVle8E3tFLUJiebL1UPevO3fmmZHWC+7idjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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