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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a400c2ba4456ca239983d727c99cfd87f80a36de5871577d8ff943217105bc2' 
  AND token = 'owbaoTSWoZh+NynFnL19LVotRWMqu7jGMZIfBc6R6Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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