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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5da0ec65e4a9ef79e86b820c4e99e62dbf5a68b21e51bdc063eb6b234a3e03' 
  AND token = 'HgF95Q3OrJODSDwj1/1O7c91gUmT4+2qqPftxvinpXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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