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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048a845f90e14cef1618f8361ae8e4c132492f379ef800874d8f243b731cd612' 
  AND token = 'c+4lcWf4fLVIGNGxM+NrW/X6Ydn6q/vYDVzNEj30FT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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