SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da63170e5c8aa9473698f1295282f06a1871833602f301053c4ec9bde449807d' 
  AND token = 'Jcsyg3fp2GOf2J6zmVwwbLCMg9iKRz5VYwcomAD+n6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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