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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba98637746a9240d17595b1761957d1871a77a955f7daabaaa2e0da9a45bb590' 
  AND token = '28AStFAkJ4hiV0AEikGveTvsAT5Y1sSI+zcoKSYRZLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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