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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cd2b6f21918a7655a54774e6be75a93a6acbf6bf074800be11269ed62a3d0d' 
  AND token = '1EzE50GbyTAwnDkGe7feadNFYLrHbJsM/FT+uip5H3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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