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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38913506346953052d83cc170b18640922e79b9c3d79b2cd604b4d6ec92bd58e' 
  AND token = 'vZ0UK3wFo5LBHZ6enD1gYwBrEwFvwfEf04CaWsfuEbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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