SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5136f0d0e7c1f6afb8d3142288f3d67a72544975926709acaabebc60181ea665' 
  AND token = 'LS8/3snJkguUvyjCR4G4rxgObM6YEuO+m1XtVDB28HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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