Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5c5781cad892ebbf9c80ed5d89dd483ffdf99d74aa2e460460409d457c08c6' 
  AND token = '2ItOHs0F8VdHxXo0nD65ji6y0tD2+lLyM75xaV/KfZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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