SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697c0793220f3fc6641a8fc3acab8444625478e25c9256763b3131cd0345f6c2' 
  AND token = 'fh0D1uP/hrll2yqJVgDi/fBt7wh2I5z2T7+kqVJh/jY=' 
  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"
    }
  }
}