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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43397ce1b5c0244ad39f241ebeee88176f4fa6dc6949b42dd3a500b01894d9dd' 
  AND token = 'Wt7FzFkxp3sNktU2T/b3CNmiUuuC3RSBjyjVp5/GNCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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