Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71350f11e75c6838b706a6bd1aff4b6cdcc553e3f3ac984a183242e5719dff45' 
  AND token = 'w+aa5TYDbkV3Y3bqUnp+sKEslYag6uz/VFP6D2kwmdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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