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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44d5cec81a01a883058ad875db166765dea99a07f80b8c42603cbdf1f2d417f' 
  AND token = 'KGsu537Y6FzIhp52cH4A0cbfPXYFoA4/TVKSAy8MdgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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