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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5161b02a8ba1a17d9a4f7df10fb1e9c663d0fb68e5a31fdc99edabdcbc5f356b' 
  AND token = 'lPFIbpAF42kqE7C3l5/vlxPF8dby1bqkg7Ba4xfpEwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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