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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb3e8a10a761f536d6176c27b4f7d50220e0692970196c1ed074d2f0e99b5b5' 
  AND token = 'Vh70fF7t8gZh3bTvxhIfT1H9feUi1oTh1rksH1hzXcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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