SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c56fab40b7cf514d12256b48300ed9e8f33f219d55a411bdf4a3f82e8c9ec95' 
  AND token = 'aaDHfxZc4+Vm+n+G1GzGLrBjQ8Q9th7YF1tYKTmfPyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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