SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3527c7471fa44255fe194d2438fd45cdd6b5a26ae93b861ff1a668e3bc28fb1f' 
  AND token = '+mWAnnswwHf/lVdg+YLAwqoOvvR6PToibfWG72Gl0oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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