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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd36f57063b29f5975febc582c6d546af7317897766f2b8cb56c60e3f4c8eee6' 
  AND token = 'LGNX/2ozDGNA2TPOfyzCDqjT7tuMKVc/M6gek41GDtQ=' 
  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"
    }
  }
}