Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809533891d72cf8be63ac1b8b9f106ec8659139fb3dfdf5f9bf4b82098c25b0a' 
  AND token = '328kQxlSoDNpHXPKH+pkpQSeXBzDJB7DPrgAxzEUTnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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