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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292f877562a9991b97dd050c8bc460c71c417195cd130f97e76bf89f961d52b6' 
  AND token = 'Pox/Yab7sMcOiBKXL9q11xMh7PpBZfEHnEIyLkTmneE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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