Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71678927b56aac4d8495bf74263606b15c571881b80902a9492af2ede7a8e517' 
  AND token = 'VO8rOS6f4DoWBMfhEVZlnM1EmTTLCBlxyEof+4gEd9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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