SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307f4989de8ab56994c2107e8846a6e231f89b4e80d99c5e69d1e4fdf73d6dba' 
  AND token = 'lXSTplUxMDGLXBzmZyjFEgBEJVcadfCxr3f34WUY/zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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