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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79a760e516db2dd2556fc50c9395076a4a1e275853b73f3e1eb63238ea683ef' 
  AND token = 'Kqev9j6qg15fcA4KngK05xqF0pNavsezdmKYGgNc1/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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