Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6fb08c7082092f13643f6a0e5bf8d0966d240b83ebda3e06a50500d62e6c01' 
  AND token = 'CSRJG18xD+0yHAJwT5sElMfvhZs8ji3waLAU0kZFRAY=' 
  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"
    }
  }
}