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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3904003d3d81fd7e11fb6786e2ffd8433aaa1ce82405e130b7d1e3446b455e16' 
  AND token = 'Ww3Wkitcwzz5Yn8UZybhv5Dn2TEjfkGPhjxgrKZM0DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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