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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f825a1ce9a3ce5c8ce15e511a696f39bc543230fc992ae7980a8a00809feee' 
  AND token = 'Mw4FhfhHCaFTiiNoiP5OijXl36+Ztb35I6MAXxZSSGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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