Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591f2a08322de9a0ffbb0e7a3360b4f0facd3f0080f57a3d170d1089986cf768' 
  AND token = 'yVVmbGL+Bc3nMafyMpbKvRAJ4GNiF4kNF8ag7fexmxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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