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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7505e7e9d67004a09374e5ee26ebfd0f9f8e17815eb5472564f20c4254396fcb' 
  AND token = 'XElVOpts4Z30ZDhDs/DY7WG2hQormSzHCZ0wt8F4mWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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