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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063ea463a0c56267d847a42a7d993e598a79d704c75157a43fb12409e977a8e6' 
  AND token = 'nmSWr7vbiGT4Vkzz7j0XQvsIX4Vm3jmK+ODyCtrdgAE=' 
  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"
    }
  }
}