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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be3b352e1da889f3280b70ed8f3110dde2f3b27876ee3f781586acf2505dfb4' 
  AND token = 'DuKqDHDfQLKJHceP8moTgI8bLA5Kib2xK60SwN1hGn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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