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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c269c538cb0597c402574e1e28a5b8454029c4362944788051395126192eefd' 
  AND token = '9iWmsLVKrzJXIkqPt/2MthgCV9+mP+I1EMng/lDpWkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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