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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d2bf1c09deeba09e36d7e40cee6ff1c53e9d424f2359a2569c8b2a8be3ddf1' 
  AND token = 'RGDPwTaAOInevQX+vFx/2YEgWpVl5rGE6UTVvpg0KgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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