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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa20e2ef80f0aabb3cfd2ebf8e9aceffc0a1380d8b9e8d9b5c297dc1fb83b3e' 
  AND token = 'VWxLLBseefuiUNimQ/wclu4ZDomQ3jWw1d9G9DRXr3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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