Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13dd714465abe2e166dccae084269cbd1d08120ef30790d52cf2f7e62a57bc2a' 
  AND token = '5Gz2Mnff/22T7CerVyVYFRI4qtuzRMaN3U9ECftLZXM=' 
  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"
    }
  }
}