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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34c336a7907cde4f2953d8a6c2d4a0438fadf30e79eb33e2ac7b4cb49bab335' 
  AND token = 'RrxAB32Mz8zYS9fDpnStiYx/JlxSCF+xbG5rZxD+GCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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