SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad511f23a8d4a80fb56cb1927321639624df4f2527c69bc0479e4fd17886eda' 
  AND token = 'YefNsGAyT+A3wQt8ZBy9Knkw46pUFcHLWGV9SrKYWZo=' 
  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"
    }
  }
}